Find the weight of the pendulum bob by using the following apparatuses: retort stand, clamps, metre rule, cotton thread, wood pads and stopwatch. Conduct an experiment through the given procedures and then answer the questions that follow. Procedures: (a) Set the experiment in such a way that the pendulum bob is at a height, (H) = 100 cm from the ground to the centre of the bob and a length, l of the thread be 60 cm from the point of suspension to the centre of the pendulum bob. (b) Slightly displace the pendulum bob at a small angle and release to allow it swing and measure the time t required to complete 20 oscillations and calculate its periodic time T. (c) Repeat the procedure in 1(b) by increasing the length of thread, l = 70 cm, 80 cm, 90 cm, 100 cm and 120 cm each time recording the values of H and t and hence its corresponding periodic time T. (d) Finally, measure the mass m in kg of the pendulum bob, by using a beam balance.

1. Draw a labeled diagram of the experimental set up. (2 alama)
2. Tabulate your results, including the values of t, l, H, T and T 2 . (2 alama)
3. Plot the graph of H (cm) against T 2 ( sec 2 ). (2 alama)
4. Determine the slope, S of your graph. (1 alama)
5. Determine the weight W of the metal ball in newton, given that 0.0254 1 W    mS  42K (1 alama)
6. Show that T 2 intercept  g (1 alama)
7. What is the physical meaning of K? (1 alama)

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Conduct an experiment to verify whether wire Q has high conductivity or the same as that of copper. Follow the procedures provided and then answer the questions that follow. Procedures: (a) Connect a dry cell, an ammeter, a voltmeter, a key K and rheostat in series. (b) Join a voltmeter across the battery terminal. (c) With the Key K open, record the voltmeter reading. (d) With the Key K closed, adjust the rheostat so that the ammeter pointer is at exactly 0.2 A and record its corresponding voltmeter reading in volts. (e) Repeat procedure 3 (d) with ammeter readings of 0.4, 0.6, 0.8 and 1.0 A.

1. Tabulate your results, including the values of I and V. (0 alama)
2. Draw a well labeled diagram for the experimental set-up. (0 alama)
3. Plot a graph of V and I. (0 alama)
4. Use your graph to determine the internal resistance and e.m.f of that dry cell and comment on your answer comparing to the value given by the factory. (0 alama)
5. If the dry cell used in 3 (iv) is replaced by another dry cell an internal resistance that is twice that of the first one, what will be the magnitude of the current flowing in the circuit? (0 alama)

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